(19)
(11) EP 2 532 380 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
14.06.2017 Bulletin 2017/24

(43) Date of publication A2:
12.12.2012 Bulletin 2012/50

(21) Application number: 12178284.1

(22) Date of filing: 30.08.2007
(51) International Patent Classification (IPC): 
A61M 16/00(2006.01)
 A61M 16/06(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR

(30) Priority: 30.08.2006 US 823934 P

(62) Application number of the earlier application in accordance with Art. 76 EPC:
07800212.8 / 2063941

(71) Applicant: ResMed Limited
Bella Vista, NSW 2153 (AU)

(72) Inventor:
  • Bassin, David John
    Bella Vista, New South Wales 2153 (AU)

(74) Representative: Vossius & Partner Patentanwälte Rechtsanwälte mbB 
Siebertstrasse 3
81675 München
81675 München (DE)

   


(54) Determination of leak during CPAP treatment


(57) In a CPAP or positive pressure ventilation system, leak is determined at each instant by a lookback for a time as long as single breath to establish the start of an averaging window over which low-pass filtered values used in the determination of a parameter of a leak model are averaged. A jamming index indicates whether the leak is rapidly changing. To the extent that jamming is high, the leak estimate used progressively changes from that using sliding breath-window averaging to a more robust and faster responding low-pass filter method, and adjustment of ventilatory support based on measures employing estimated respiratory flow is slowed down or stopped.







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Search report